I logged in as admin an createt a customer account (filled in the basics and settet up an username and password)
after I saved this I created an web for the customer like you can see on the following screenshot:

^^ admittedly I don't know what the www is standing for or what it means because my hostname isn't www?!
The secound thing is that my server's name is shown as "Server 1" on the screenshot above - is this correctly - I mean the space between server an the one?

After that I created a co-domain - but without much success because I don't know how to handle. I sadly couldn't understand the examples in the admin howto. but I tried ma luck anyway. You could see a screenshot of it below:http://hure.gotdns.com/ISPconf/Bildschirmphoto4.png

With the shown screenshot entries on the ISPconf I get allways ERROR 404 when I type http://pc1mail/web1
once it is in blue - powerd by ISPconf - and when I'm playing with the "create dns and dns mx" options it will be shown the same error 404 but not with the blue design.

if I left dns stuff empty and log in as the customer I can rech my ftp space via webftp but not from outside? How is the domain for it from ouside and why do I always get error 404?

On my server is nothing more or less installed than falko's howto is telling.

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my goal is it to create a subdomain for each web like web1.pc1mail.de and how to reach web space ftp from outside (but I think that's solved with the subdomains - am I right?)

Is 195.20.225.111 your public IP address?
What's in Vhosts_ispconfig.conf?

The secound thing is that my server's name is shown as "Server 1" on the screenshot above - is this correctly - I mean the space between server an the one?

Click to expand...

That's the server name you enter under Management -> Server -> Settings -> Server -> Server Name. It has nothing to do with the hostname of the server, it's just a string so that you know which server it is.

if I left dns stuff empty and log in as the customer I can rech my ftp space via webftp but not from outside? How is the domain for it from ouside and why do I always get error 404?

Click to expand...

Did you forward port 21 from your router to your ISPConfig server? Have you tried both active and passive transfers in your FTP client?
You can use any FQDN that points to your router's public IP address. You can also use the router's public IP address.

The "Default DNS" and Default MX" checkboxes let you create standard DNS records for your domain, but it makes sense only if your ISPConfig server is the authoritative name server for your domain. Most likely this is not the case, so you don't need to check them.